A woman was at home in Billings, Mont. when her estranged boyfriend came to her front door, and when he was refused entry, kicked in the back door of the house. As the abusive ex-boyfriend came inside, the woman retrieved a gun and forced him from the property. The woman then called police, who captured the criminal a short time later.Evidently, the firearm the woman keeps for self-defense proved more persuasive than the order of protection issued against the ex-boyfriend in December.